fast

My bike build goes 45mph has great pick up speeds and has been running clean without breaking for a year and a half!
This is what I have purchased:
1. 66/80cc Flying Horse Silver Angle Fire Bicycle Engine Kit-bikeberry
2. BBR Tuning Silver Boost Bottle Induction Kit-bikeberry
3. BBR Tuning...

I have a Schwinn OCC Stingray chopper and I want to put a motor on it. I want it to go rather fast but still be able to make it up hills quite well. My budget is $400. What should I buy to make this bike an awesome one?